**Question:** The sputum examination under DTP (direct smear, culture, and sensitivity) is done when the patient presents with:

A) Cough of 1–2 weeks duration
B) Persistent cough of 1–2 weeks duration
C) Hemoptysis
D) Chest pain
E) Intermittent fever

**Correct Answer:**

**Core Concept:** The primary purpose of sputum examination under DTP (direct smear, culture, and sensitivity) is to identify pathogenic microorganisms, their presence, and their susceptibility to antibiotics, which is crucial for initiating appropriate antimicrobial therapy in patients with respiratory infections.

**Why the Correct Answer is Right:**

When a patient presents with a persistent cough of 1–2 weeks duration, the sputum examination under DTP is most relevant. Direct smear examination (D) is done to identify the presence of microorganisms (bacteria, fungi, or parasites) that may cause the cough. Culture (C) is performed to grow and identify the causative organism, allowing for speciation and susceptibility testing, which helps to determine the most effective antimicrobial agent(s) to use. Sensitivity (P) is performed to determine the organism's sensitivity to various antibiotics, ensuring the chosen drug(s) will effectively target the causative microorganisms.

**Why Each Wrong Option is Incorrect:**

A) Cough of 1–2 weeks duration is not specific enough, as many non-infectious causes can present with a similar duration of cough.

B) Cough of 1–2 weeks duration is also not specific enough, as the duration alone does not necessarily indicate an infectious cause.

C) Hemoptysis (coughing up blood) may be a symptom of a severe infection or other conditions, but the examination itself (DTP) is not specific for hemoptysis alone.

D) Chest pain is a symptom but not a specific indication for sputum examination under DTP, as it may arise from various respiratory or non-respiratory causes.

E) Intermittent fever (fever occurring occasionally) is not a definitive indication for sputum examination under DTP, as fever alone is not a strong enough reason to perform the test without a clear infectious etiology.

**Clinical Pearl:**

The appropriate indication for sputum examination under DTP is a persistent cough of 1–2 weeks duration in a patient with suspected respiratory infection. In this context, the examination aids in identifying the causative microorganisms, determining their susceptibility to antibiotics, and guiding antibiotic therapy. A thorough clinical evaluation, including a thorough history and physical examination, remains essential to confirm the diagnosis and rule out other causes of a persistent cough, ensuring that the sputum examination under DTP is performed in the appropriate clinical context.