The healthcare provider orders 5,000 units of heparin subcutaneously every 8 hours. The vial label reads heparin sodium 10,000 units/mL. How many milliliters should the nurse administer per dose? (DO NOT ROUND. LABEL CORRECTLY TO RECEIVE CREDIT)

A. Sputum culture for AFB: A sputum culture for acid-fast bacilli (AFB) is the definitive diagnostic test for active tuberculosis. It confirms the presence of Mycobacterium tuberculosis by identifying and culturing the bacteria from sputum, which is the most reliable confirmation of disease.

B. Chest x-ray: A chest x-ray can show lung abnormalities consistent with TB, such as cavitations or infiltrates, but it cannot confirm active infection. It is useful for supporting diagnosis but must be interpreted alongside microbiological tests.

C. Mantoux test: The Mantoux (PPD) test identifies TB exposure by measuring delayed hypersensitivity, but it does not distinguish between latent and active infection. A positive result requires further testing to confirm active disease.

D. Pulmonary function test: Pulmonary function tests assess lung capacity and airflow but are not used for diagnosing tuberculosis. They may be used later to evaluate lung impairment but have no role in confirming TB.

A. Remove the client's O₂ mask:Removing supplemental oxygen is unsafe and may worsen hypoxia. Even though oxygen must be carefully titrated in COPD, abrupt removal is never appropriate without medical direction, especially when the client is already hypoxemic.

B. Notify the physician:The ABG shows respiratory acidosis (low pH, elevated pCO₂) with insufficient compensation and potential respiratory failure. Immediate provider notification is warranted to adjust oxygen delivery, initiate or escalate respiratory support, or evaluate for further interventions.

C. Have the client breathe into a paper bag:Paper bag breathing is used for respiratory alkalosis caused by hyperventilation, not for respiratory acidosis. This action would further elevate CO₂ and worsen the client's acid-base status.

D. Place the patient in left side-lying position:Side-lying positioning does not address the critical issue of respiratory acidosis. Instead, placing the client in high Fowler’s position might help improve ventilation, but first the provider must be notified to address the urgent ABG findings.