What is the likely diagnosis and recommended treatment for a patient with leukocytosis (neutrophilia and eosinophilia), mild thrombocytopenia, macrocytosis, elevated fasting glucose, high BUN‑to‑creatinine ratio, low total protein, low HDL cholesterol, vitamin D deficiency, and folate deficiency?

Multiple Nutritional Deficiencies with Metabolic and Hematologic Abnormalities

You have macrocytic anemia due to folate deficiency, vitamin D deficiency, pre-diabetes, and possible dehydration or early kidney dysfunction—all of which require immediate supplementation and lifestyle modification to prevent progression to more serious complications.

Primary Diagnoses and Immediate Concerns

Your laboratory results reveal several interconnected problems that need urgent attention:

1. Macrocytic Anemia from Folate Deficiency

Your MCV of 104.8 fL indicates macrocytosis (>100 fL), and your folate level is critically low (<24 ng/mL). **Macrocytosis most commonly indicates vitamin B12 or folate deficiency** 1. The European consensus guidelines confirm that macrocytosis with MCV >100 fL strongly suggests vitamin deficiency 2.

• Your hemoglobin of 13.5 g/dL is borderline normal for men (normal ≥13.0 g/dL) 2, but the macrocytosis indicates impaired red blood cell production
• The low MCHC (30.8) suggests your red cells aren't carrying adequate hemoglobin
• Critical point: Even without frank anemia, macrocytosis requires evaluation and treatment, as it may be the first sign of underlying pathology 3

Treatment for folate deficiency:

• Folic acid 1-5 mg daily orally until levels normalize (typically 1-4 months)
• Recheck complete blood count in 4-6 weeks to confirm MCV improvement
• Warning: Before starting folate, vitamin B12 deficiency must be ruled out with serum B12 testing, as treating folate deficiency alone when B12 is also low can precipitate neurologic complications 1

2. Leukocytosis with Neutrophilia and Eosinophilia

Your WBC of 13.73 × 10⁹/L is elevated (normal 4-11), with:

• Neutrophils 75.7% (elevated, suggesting infection or inflammation)
• Eosinophils 7.4% (significantly elevated; normal <5%)
• Lymphocytes 11.6% (relatively low)

The combination of neutrophilia and eosinophilia requires investigation for:

• Parasitic infection (most common cause of eosinophilia) 4
• Allergic conditions
• Chronic inflammatory process
• Less likely but must exclude: myeloproliferative neoplasm 5, 4, 6

Immediate workup needed:

• Stool examination for ova and parasites (3 samples)
• C-reactive protein (CRP) to assess inflammation
• Peripheral blood smear review to evaluate white cell morphology and rule out malignancy 4, 6
• If eosinophilia persists >6 months without explanation, hematology referral is warranted 7

3. Pre-Diabetes

Glucose of 139 mg/dL indicates impaired fasting glucose (pre-diabetes; normal <100 mg/dL, diabetes ≥126 mg/dL).

Treatment:

• Hemoglobin A1c testing to assess 3-month glucose control
• Lifestyle modification: weight loss if overweight, 150 minutes/week moderate exercise, Mediterranean or low-glycemic diet
• Repeat fasting glucose in 3 months
• Consider metformin if A1c ≥5.7% with additional risk factors

4. Elevated BUN-to-Creatinine Ratio

Your BUN:creatinine ratio of 28.9:1 is elevated (normal 10-20:1), suggesting:

• Pre-renal azotemia (dehydration) - most likely given isolated elevation
• High protein intake
• Gastrointestinal bleeding (check for this given eosinophilia)

Management:

• Increase oral fluid intake to 2-3 liters daily
• Recheck BUN/creatinine after adequate hydration
• If ratio remains elevated, evaluate for GI bleeding with stool guaiac test

5. Vitamin D Deficiency

Level of 24 ng/mL indicates insufficiency (optimal >30 ng/mL, deficiency <20 ng/mL).

Treatment:

• Vitamin D3 2000-4000 IU daily (or 50,000 IU weekly for 8 weeks, then maintenance)
• Recheck level in 3 months
• Ensure adequate calcium intake (1000-1200 mg daily from diet or supplements)

6. Low HDL Cholesterol

HDL of 42 mg/dL is low (optimal >40 mg/dL for men, but >60 mg/dL is ideal for cardiovascular protection).

Management:

• Complete lipid panel needed (total cholesterol, LDL, triglycerides)
• Lifestyle modification: aerobic exercise, weight loss, smoking cessation if applicable
• Consider statin therapy if LDL is elevated or if 10-year cardiovascular risk is ≥7.5%

7. Low Total Protein

Total protein of 6 g/dL is at the lower limit of normal (6.0-8.3 g/dL).

This may indicate:

• Malnutrition (especially with alcohol use, which commonly causes folate deficiency 2, 3)
• Malabsorption
• Chronic inflammation

Workup:

• Serum albumin and globulin levels
• Liver function tests (AST, ALT, alkaline phosphatase, bilirubin)
• Assess for alcohol use, as this is the most common cause of macrocytosis (36.5% of cases) and can cause low protein 3

Critical Next Steps Algorithm

Within 1 week:

1. Start folic acid 1 mg daily (after confirming B12 level is normal)
2. Start vitamin D3 2000 IU daily
3. Increase fluid intake
4. Order: vitamin B12 level, reticulocyte count, peripheral blood smear, CRP, stool for ova/parasites (×3), complete metabolic panel, hemoglobin A1c, complete lipid panel

Within 4-6 weeks:

1. Recheck CBC to confirm MCV improvement
2. Review all pending test results
3. Adjust treatment based on findings

Red flags requiring immediate hematology referral:

• Peripheral smear shows immature white cells, blasts, or dysplastic features 6
• Persistent unexplained leukocytosis after treating infection/inflammation
• Development of fever, night sweats, weight loss, or bruising 4
• Worsening anemia or development of additional cytopenias

Common Pitfalls to Avoid

• Never treat folate deficiency without checking B12 first—this can unmask or worsen B12 neuropathy 1, 8
• Don't dismiss macrocytosis just because hemoglobin is "normal"—20.9% of B12-deficient patients present with isolated macrocytosis without anemia 3
• Eosinophilia >1.5 × 10⁹/L persisting >6 months requires hematology evaluation to exclude myeloid neoplasms 7
• Alcohol use is the single most common cause of macrocytosis (36.5%) and must be specifically addressed 3

Your constellation of findings suggests nutritional deficiencies (likely related to poor diet, possible malabsorption, or alcohol use), metabolic syndrome, and an inflammatory or infectious process causing leukocytosis. The good news is that most of these conditions are highly treatable with supplementation and lifestyle changes, but close follow-up is essential to ensure response to therapy and rule out more serious underlying conditions.