With a repeat lactate dehydrogenase of 200 U/L in a patient with persistent pruritus and a chest radiograph showing broncovascular pattern thickening, what is the appropriate diagnostic work‑up?

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Diagnostic Work-Up for Persistent Pruritus with LDH 200 and Bronchovascular Thickening

This patient requires immediate referral to hematology and consideration of skin biopsy to rule out lymphoma, particularly given the combination of persistent pruritus, chest radiograph abnormalities, and the need for comprehensive hematologic evaluation.

Clinical Context and Concern

An LDH of 200 U/L is typically within normal range (usually <250 U/L), but the clinical picture of persistent pruritus combined with bronchovascular pattern thickening on chest X-ray raises significant concern for underlying hematologic malignancy, particularly Hodgkin lymphoma or cutaneous lymphoma 1.

Key Red Flags Present:

  • Persistent pruritus (treatment-refractory)
  • Chest radiograph abnormalities (bronchovascular thickening suggesting possible mediastinal/hilar involvement)
  • These findings together warrant aggressive investigation even with normal LDH 2

Recommended Diagnostic Algorithm

Immediate Laboratory Work-Up

Complete the hematologic panel 1:

  • Full blood count with differential
  • Blood film examination (manual review)
  • Erythrocyte sedimentation rate (ESR)
  • Liver function tests (to exclude hepatic causes)
  • Renal function (urea and electrolytes)

Critical Additional Testing

  1. Review for B-symptoms 1:

    • Night sweats
    • Unintentional weight loss
    • Fevers
    • Aquagenic pruritus (itching after water contact - characteristic of polycythemia vera)

  2. Assess complete blood count results 1:

    • If raised hemoglobin/hematocrit: Order JAK2 V617F mutation analysis for polycythemia vera
    • Look for microcytosis, raised white cell or platelet count, low ESR

Imaging and Tissue Diagnosis

Chest CT scan is essential given the abnormal chest radiograph 2. The bronchovascular thickening could represent:

  • Mediastinal lymphadenopathy
  • Hilar lymphadenopathy
  • Parenchymal lymphomatous involvement

Skin biopsy should be strongly considered 1:

  • Even with normal-appearing skin, patients can have cutaneous lymphoma
  • Random skin biopsy from the trunk is recommended for persistent, unexplained pruritus
  • This is particularly important as pruritus can be the earliest presenting sign of lymphoma, frequently mistaken for eczema 2

Specialist Referral

Refer to hematology 1:

  • Mandatory for suspected lymphoma or polycythemia vera
  • Any enlarged lymph nodes or masses on imaging require excision or ultrasound-guided core biopsy 1

Clinical Reasoning

Why This Matters Despite Normal LDH

While LDH 200 is normal, LDH elevation is not required for lymphoma diagnosis 3, 4. LDH serves as a prognostic marker but its absence doesn't exclude disease 3. The British Association of Dermatologists guidelines emphasize that pruritus with appropriate systemic symptoms requires tailored investigations regardless of initial laboratory values 1.

The Hodgkin Lymphoma Concern

Hodgkin lymphoma classically presents with pruritus (though uncommon in non-Hodgkin lymphoma) 1. A recent case report demonstrated a 25-year-old with chronic pruritus, chest mass, and elevated LDH who was initially misdiagnosed with eczema - ultimately proven to be Hodgkin lymphoma 2. Chest imaging revealed disease even without palpable lymphadenopathy 2.

Polycythemia Vera Consideration

If blood counts show elevation, PV must be excluded as it characteristically presents with aquagenic pruritus 1.

Common Pitfalls to Avoid

  • Don't dismiss pruritus as purely dermatologic when systemic features or imaging abnormalities are present
  • Don't wait for LDH elevation before pursuing lymphoma work-up 2
  • Don't skip skin biopsy in persistent unexplained pruritus - cutaneous lymphoma can present with normal-appearing skin 1
  • Don't delay chest CT when chest X-ray shows abnormalities in the setting of concerning symptoms

Additional Considerations

If initial hematologic work-up is unrevealing, consider 1:

  • Ferritin levels (iron deficiency can cause pruritus)
  • Hepatitis serology
  • HIV testing
  • Thyroid function (only if additional clinical features suggest endocrinopathy)

The combination of persistent pruritus and chest radiograph abnormalities mandates aggressive investigation for lymphoma, regardless of normal LDH 1, 2.

References

2
Research

Chronic pruritus as the presenting symptom of Hodgkin lymphoma: A case report.

The American journal of emergency medicine, 2026

3
Research

Lactate dehydrogenase in dermatology practice.

Clinical and experimental dermatology, 2020

4
Research

The clinical value of lactate dehydrogenase in serum: a quantitative review.

European journal of clinical chemistry and clinical biochemistry : journal of the Forum of European Clinical Chemistry Societies, 1997

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