NU136 Ch24

Diagnostic Tests and Specimen Selection

Introduction

  • The discussion begins with diagnostic tests relevant to medical assessments, emphasizing the importance of thorough knowledge before performing any tests.

  • Emphasis on assessment is core to the process of ordering tests such as X-rays and lab work. Preparing the patient with information helps alleviate fears or concerns surrounding their tests.

Pre-Test Considerations

Patient Communication

  • Once a test is ordered, timely communication regarding the scheduled test is crucial. Inform the patient of the timing and ensure they can notify family of their temporary absence from the room.

  • Address any patient or family questions or concerns about the procedure, including safety measures and potential allergies related to tests like CT scans with contrast dye.

Equipment and Safety

  • Certain diagnostics, like MRIs, require the removal of metal objects from the body, including jewelry and hair accessories, as metal can interfere with imaging.

  • Patients should fill out forms disclosing any metal implants, such as pacemakers or joint replacements, as these can pose risks during testing.

Preparation for Specific Tests

Common Preparations

  • For procedures, assess what supplies are necessary, including scrubbing the skin with antiseptic wipes or completing bowel preparations for tests like colonoscopies.

  • Pre-test instructions may include dietary restrictions to prepare the body for tests (e.g., fasting or clear liquids).

Medication Considerations

  • Before administering anesthesia, confirm that the patient has not ingested substances like cigarettes or gum, which may affect anesthetic efficacy.

Types of Diagnostic Tests

Imaging Tests

  • Imaging tests, such as MRIs and CT scans, provide critical views of internal organs and structures.

  • Common tests include:

    • MRI: Useful for viewing soft tissues and the brain, highly relevant for neurological assessments.

    • CT Scan: Offers detailed imaging of organs and tissues, potentially using contrast for clarity.

  • Educate patients about the sounds during an MRI and the sensation of warmth during contrast administration in CT scans.

Laboratory Tests

  • Complete Blood Count (CBC): Provides data on overall health, indicating conditions like anemia or infections through white and red blood cell counts.

  • Prothrombin Time (PT) and Partial Thromboplastin Time (PTT): Important for monitoring blood coagulation, particularly for patients on anticoagulants such as Warfarin or Heparin.

  • Erythrocyte Sedimentation Rate (ESR): A test indicating inflammation levels in the body.

Post-Test Instructions

  • After tests like colonoscopies, patients may experience mild discomfort and are advised on dietary choices to ease their recovery.

  • It is crucial to outline expected results and timelines to patients while also reinforcing that only the doctor can communicate direct results.

Types of Specimen Collection

  • Routine assessments may include:

    • Urine Dipstick Tests: Quick tests for abnormalities that can be done at the bedside.

    • Occult Blood Testing: Evaluates for GI bleeding through stool specimens.

    • Throat Cultures: Essential for diagnosing infections, requiring careful contamination controls during sample collection.

Invasive Procedures

Endoscopy

  • Procedures like bronchoscopy or colonoscopy involve direct visualization and biopsy capabilities, necessitating informed consent and proper pre-operative preparations, including NPO (nil per os) guidelines to avoid aspiration risks.

Cardiac Studies

  • Cardiac Catheterization: Used to assess heart function through invasive techniques, often requiring a prolonged rest period post-procedure to prevent bleeding.

Summary of Key Points

  • Patient education is a vital component throughout the entire diagnostic testing process, from pre-test preparations to post-test Recovery.

  • Understanding the significance and protocols of various tests optimizes patient outcomes and enhances the quality of care provided in medical settings.