One-liner#

Recognize symptomatic hyperglycemia (polyuria, polydipsia, weight loss) as potential new diabetes; distinguish type 1 vs type 2; initiate appropriate therapy while identifying who needs urgent evaluation for DKA or HHS.

Quick nav#

• Red flags / send to ED
• Key history
• Focused exam
• Differential (quick pattern recognition)
• Workup
• Initial management
• Management by diagnosis
• Follow-up
• Patient instructions
• Smartphrase snippets

Red flags / send to ED#

• DKA (diabetic ketoacidosis): Glucose >250 + nausea/vomiting + abdominal pain + altered mental status + Kussmaul breathing → call 911
• HHS (hyperosmolar hyperglycemic state): Glucose >600 + altered mental status + severe dehydration → call 911
• Unable to tolerate oral intake (vomiting, severe nausea) → ED
• Signs of severe dehydration: Hypotension, tachycardia, oliguria, altered mental status → ED
• New diabetes in a sick patient: Infection, acute illness + new hyperglycemia → consider ED

DKA clues: Fruity breath, rapid deep breathing, abdominal pain, nausea/vomiting, confusion HHS clues: Profound dehydration, altered mental status, often elderly with type 2 DM

Key history#

Classic hyperglycemia symptoms (the “polys”):

• Polyuria (frequent urination, nocturia)
• Polydipsia (excessive thirst)
• Polyphagia (increased hunger) with weight loss
• Fatigue, weakness
• Blurred vision

Timeline:

• Acute onset (days to weeks): think type 1 or secondary diabetes
• Gradual onset (months): typical type 2
• Incidental finding on labs: often asymptomatic type 2

Risk factors for type 2 diabetes:

• Obesity (BMI ≥25, or ≥23 in Asian Americans)
• Family history (first-degree relative)
• Age ≥45
• Ethnicity (African American, Hispanic, Native American, Asian American, Pacific Islander)
• History of gestational diabetes
• Polycystic ovary syndrome
• Hypertension, dyslipidemia
• Physical inactivity
• Prediabetes (A1c 5.7-6.4%)

Red flags for type 1 diabetes:

• Younger age (<40, but can occur at any age)
• Lean body habitus
• Rapid onset of symptoms
• Significant weight loss
• Personal or family history of autoimmune disease
• Prior episode of DKA

Medication review (drug-induced hyperglycemia):

• Corticosteroids (most common)
• Atypical antipsychotics (olanzapine, clozapine, quetiapine)
• Thiazide diuretics (mild effect)
• Beta-blockers (mild effect)
• Statins (small increased risk)
• Immunosuppressants (tacrolimus, cyclosporine)
• HIV medications

Other secondary causes:

• Pancreatitis, pancreatic cancer
• Cushing’s syndrome
• Acromegaly
• Pheochromocytoma
• Hemochromatosis

Associated symptoms to ask about:

• Infections: recurrent UTIs, yeast infections, skin infections
• Neuropathy symptoms: numbness, tingling, burning in feet
• Wound healing: slow-healing cuts or sores
• Sexual dysfunction

Focused exam#

Vital signs:

• Blood pressure (hypertension common in type 2)
• Heart rate (tachycardia if dehydrated)
• Weight, BMI

General:

• Body habitus (obesity vs lean)
• Signs of dehydration (dry mucous membranes, poor skin turgor)
• Acanthosis nigricans (velvety hyperpigmentation in skin folds—insulin resistance marker)

Skin:

• Acanthosis nigricans (neck, axillae, groin)
• Skin infections, slow-healing wounds
• Necrobiosis lipoidica (rare, shiny atrophic plaques on shins)

Eyes:

• Fundoscopic exam if equipment available (diabetic retinopathy)
• Visual acuity

Cardiovascular:

• Blood pressure
• Peripheral pulses
• Bruits

Neurologic:

• Monofilament testing (10g monofilament on plantar foot)
• Vibration sense (128 Hz tuning fork on great toe)
• Ankle reflexes

Feet:

• Skin integrity, calluses, ulcers
• Nail abnormalities
• Deformities (Charcot foot)
• Pedal pulses

Differential (quick pattern recognition)#

Common/likely (outpatient)#

Can’t-miss / urgent#

Workup#

Diagnostic criteria for diabetes (any one of the following):

Confirmation: If asymptomatic, confirm with repeat testing (same or different test) on a separate day. If symptomatic with random glucose ≥200, diagnosis is confirmed.

Initial workup for new diabetes diagnosis:

When to check for type 1 diabetes or LADA:

• Lean patient without typical type 2 risk factors
• Rapid progression or poor response to oral agents
• History of DKA
• Other autoimmune conditions

When to check for ketones:

• Glucose >250 mg/dL with symptoms (nausea, vomiting, abdominal pain)
• Suspected type 1 diabetes
• Sick day management in known diabetic

Methods: Urine ketones (office POC) or serum beta-hydroxybutyrate (more accurate)

When NOT to order:

• OGTT for routine diagnosis (A1c is simpler and sufficient)
• C-peptide and antibodies for typical type 2 presentation
• Extensive workup for secondary causes unless clinical suspicion

Initial management#

Triage by presentation:

Lifestyle counseling (all patients):

• Medical nutrition therapy (referral to dietitian)
• Weight loss goal: 5-7% of body weight
• Physical activity: 150 min/week moderate intensity
• Smoking cessation
• Diabetes self-management education (DSME)

When to start insulin immediately:

• Suspected type 1 diabetes
• DKA or HHS (after ED stabilization)
• A1c >10% with significant symptoms
• Pregnancy
• Catabolic features (significant weight loss)

Management by diagnosis#

Type 2 diabetes (new diagnosis)#

Education:

• Diabetes is a chronic condition but can be well-controlled
• Lifestyle changes are foundational and can be very effective
• Medications help but don’t replace healthy eating and activity
• Regular monitoring and follow-up are essential
• Complications are preventable with good control

Treatment (ADA 2024 guidelines):

First-line for most patients:

Metformin renal dosing:

• eGFR ≥45: full dose
• eGFR 30-44: max 1000 mg/day; do not initiate if <45
• eGFR <30: discontinue

Second-line agents (add to metformin based on patient factors):

Choosing second-line therapy:

• ASCVD or high CV risk: SGLT2i or GLP-1 RA with proven CV benefit
• Heart failure: SGLT2i (empagliflozin, dapagliflozin)
• CKD (eGFR 25-60 or albuminuria): SGLT2i
• Obesity/weight management priority: GLP-1 RA > SGLT2i
• Cost is primary concern: Sulfonylurea or TZD
• Hypoglycemia risk (elderly, CKD): Avoid sulfonylureas; prefer DPP-4i, SGLT2i, or GLP-1 RA

SGLT2 inhibitor renal thresholds (2024 guidelines):

• Can initiate if eGFR ≥20 (for cardiorenal protection)
• Glycemic efficacy diminishes below eGFR 45, but cardiorenal benefits persist
• Continue until dialysis or transplant if tolerated

Sick day rules (counsel all patients):

• Metformin: Hold if unable to eat/drink, vomiting, diarrhea, or dehydration risk; resume when eating normally
• SGLT2 inhibitors: Hold during acute illness, surgery, or fasting (risk of euglycemic DKA)
• Sulfonylureas: Hold if not eating (hypoglycemia risk)
• GLP-1 RA: Can usually continue unless severe GI symptoms

A1c targets:

• Most adults: <7%
• Elderly, limited life expectancy, hypoglycemia risk: <8% or individualized
• Younger, newly diagnosed, no complications: <6.5% if achievable without hypoglycemia

Follow-up: 2-4 weeks after starting metformin (tolerability); A1c in 3 months; then every 3-6 months until stable.

Type 1 diabetes (new diagnosis)#

Recognition:

• Lean patient, often younger (but any age)
• Rapid onset of symptoms
• Significant weight loss
• May present with DKA
• Positive GAD65 antibodies, low C-peptide

PCP role:

• Recognize and refer urgently to endocrinology
• If DKA suspected → ED
• Patient will need insulin (cannot be managed with oral agents alone)
• Provide diabetes education and support

Initial management (if endocrinology not immediately available):

• Start basal insulin (e.g., glargine 0.2 units/kg/day or 10 units daily)
• Refer to endocrinology within 1-2 weeks
• Ensure patient has glucometer and knows hypoglycemia symptoms
• Provide ketone testing supplies

Do NOT delay insulin in suspected type 1—oral agents will not work and patient can deteriorate.

LADA (latent autoimmune diabetes in adults)#

Recognition:

• Adult onset (usually >30)
• Initially may respond to oral agents
• Lean or normal weight
• Progressive beta-cell failure over months to years
• Positive GAD65 antibodies

Management:

• May initially manage like type 2
• Will eventually need insulin (usually within 6 months to 6 years)
• Refer to endocrinology for co-management
• Avoid sulfonylureas (may accelerate beta-cell failure)

Steroid-induced hyperglycemia#

Key points:

• Common with prednisone ≥20 mg/day
• Typically causes postprandial hyperglycemia (afternoon/evening)
• May unmask underlying prediabetes/diabetes
• Often resolves when steroid stopped (but not always)

Management:

• If mild (glucose <200): monitor; may not need treatment
• If moderate-severe: start medication
  • Short-term steroids: consider sulfonylurea or short-acting insulin
  • Long-term steroids: metformin ± other agents
• Check A1c after steroid course to assess for underlying diabetes

Prediabetes#

Definition: A1c 5.7-6.4%, fasting glucose 100-125, or 2-hour OGTT 140-199

Management:

• Intensive lifestyle intervention (goal 7% weight loss, 150 min/week activity)
• Consider metformin if:
  • BMI ≥35
  • Age <60
  • History of gestational diabetes
  • Rising A1c despite lifestyle changes
• Recheck A1c annually (or every 6 months if high-risk)

Progression risk: ~5-10% per year progress to diabetes without intervention; lifestyle intervention reduces risk by 58%.

Follow-up#

New diabetes diagnosis:

• 2-4 weeks: assess medication tolerability, reinforce education
• 3 months: repeat A1c; adjust therapy if not at goal
• Then every 3-6 months until stable; every 6 months once at goal

Annual diabetes care:

• A1c (every 3-6 months if not at goal; every 6-12 months if stable)
• Lipid panel
• UACR (urine albumin-to-creatinine ratio)
• eGFR
• Dilated eye exam (ophthalmology referral)
• Comprehensive foot exam
• Blood pressure check (every visit)
• Review of self-monitoring glucose logs
• Medication reconciliation
• Immunizations (flu annually; pneumococcal; hepatitis B if not immune)

Return precautions:

• Symptoms of hyperglycemia worsening (increased thirst, urination, weight loss)
• Nausea, vomiting, abdominal pain (possible DKA)
• Signs of hypoglycemia (shakiness, sweating, confusion)—especially if on sulfonylurea or insulin
• Foot wounds or infections
• Vision changes

Patient instructions#

• Diabetes means your body has trouble controlling blood sugar. With treatment and lifestyle changes, you can live a healthy life.
• Take your medication as prescribed, even if you feel fine. Diabetes often has no symptoms until complications develop.
• Check your blood sugar as directed. Keep a log to bring to your appointments.
• Eat regular meals with consistent carbohydrates. A dietitian can help you plan meals.
• Aim for at least 30 minutes of physical activity most days.
• Check your feet daily for cuts, blisters, or sores. Wear shoes that fit well.
• Keep all your follow-up appointments, including eye exams and lab work.
• Call us if you have increased thirst, frequent urination, nausea/vomiting, or feel very unwell—these could be signs your blood sugar is dangerously high.
• If you take medication that can cause low blood sugar, know the symptoms (shakiness, sweating, confusion) and keep glucose tablets or juice handy.

Smartphrase snippets#

.DIABETESNEW New diagnosis of type 2 diabetes. A1c [value]%, fasting glucose [value]. Patient is [symptomatic with polyuria/polydipsia / asymptomatic, found on screening]. BMI [value]. No signs of DKA. Starting metformin 500 mg [daily/BID] with meals, will titrate as tolerated. Discussed lifestyle modifications including diet, exercise, and weight loss goals. Ordered baseline labs (lipid panel, BMP, UACR). Referred to diabetes education and dietitian. Ophthalmology referral for dilated eye exam. Follow-up in 2-4 weeks for tolerability, A1c in 3 months.

.DIABETESFOLLOWUP Diabetes follow-up. Current regimen: [medications]. A1c today: [value]% (goal <7%). [At goal / above goal]. Home glucose logs reviewed: [fasting average X, post-meal average Y]. [No hypoglycemia / hypoglycemia episodes: X]. Weight [stable / up / down]. Foot exam: [normal / findings]. Plan: [continue current regimen / intensify therapy with X / adjust dose]. Next A1c in [3-6 months]. Annual labs [due / up to date]. Eye exam [due / completed].

.PREDIABETES Prediabetes identified. A1c [value]% (5.7-6.4% range). Discussed that this means elevated risk for developing diabetes but is reversible with lifestyle changes. Recommended: weight loss goal of 5-7% body weight, 150 minutes/week of moderate physical activity, dietary changes (reduce refined carbs, increase fiber). [Starting metformin 500 mg daily given BMI >35 / high risk / Will monitor with lifestyle alone]. Recheck A1c in [6-12 months]. Patient understands importance of follow-up.

.DIABETESTYPE1SUSPECT Concern for new-onset type 1 diabetes or LADA. Patient is [lean/normal weight], presenting with [significant weight loss/rapid onset symptoms/poor response to oral agents]. Checking GAD65 antibodies and C-peptide. [If symptomatic with ketones: Sent to ED for evaluation.] [If stable: Started basal insulin X units daily pending antibody results.] Urgent endocrinology referral placed. Patient counseled on signs of DKA requiring emergency care.

Related pages#

• Type 2 Diabetes (problem) — comprehensive ongoing management of type 2 diabetes
• Hypoglycemia — managing low blood sugar in diabetic patients
• Weight gain — obesity management, often comorbid with diabetes
• Hypothyroid symptoms — can present with fatigue, weight gain similar to metabolic syndrome
• Hyperlipidemia (problem) — cardiovascular risk management in diabetes
• Hypertension (problem) — blood pressure management in diabetes
• Heart failure (problem) — SGLT2 inhibitors for cardiorenal protection
• Coronary artery disease (problem) — ASCVD risk reduction in diabetes

Coding/billing notes#

• E11.9: Type 2 diabetes mellitus without complications
• E11.65: Type 2 diabetes mellitus with hyperglycemia
• E10.9: Type 1 diabetes mellitus without complications
• E10.65: Type 1 diabetes mellitus with hyperglycemia
• E13.9: Other specified diabetes mellitus without complications
• R73.03: Prediabetes
• E89.1: Postprocedural hypoinsulinemia (post-pancreatectomy diabetes)