Common Diagnostic Tests and Scans in Dhaka: Purpose, Patient Preparation & Guide

Diagnostic investigations ranging from simple blood panels to advanced cross sectional radiological scans are the bedrock of modern clinical medicine. In Bangladesh, private diagnostic centers and hospital laboratories across Dhaka perform thousands of diagnostic procedures daily to detect illnesses, monitor chronic diseases, and guide surgical planning.

However, many patients experience anxiety or face test inaccuracies simply because they were unaware of proper pre test preparation. Factors like eating breakfast before a fasting blood test, wearing metallic accessories inside an MRI room, or drinking insufficient water before an abdominal ultrasound can result in inconclusive findings or rescheduled appointments. This comprehensive guide outlines the purpose and essential preparation guidelines for common diagnostic tests in Dhaka.

1. Routine Pathology & Blood Investigations

Complete Blood Count (CBC)

• Purpose: Evaluates overall health and detects a wide range of disorders including anemia, bacterial infections, viral fevers (such as Dengue or Typhoid), and clotting abnormalities.
• Preparation: Generally requires no fasting. You can eat and drink normally prior to blood draw.

Fasting Blood Sugar (FBS) & Lipid Profile

• Purpose: Measures fasting glucose (for diabetes screening) and blood fats including Total Cholesterol, LDL, HDL, and Triglycerides (for cardiovascular risk assessment).
• Preparation: Requires strict overnight fasting of 10 to 12 hours. You may drink plain water, but refrain from tea, coffee, smoking, or breakfast until the sample is collected.

Liver Function Test (LFT) & Kidney Function (Serum Creatinine)

• Purpose: Assesses liver enzymes (SGPT/ALT, SGOT/AST, Bilirubin) and renal filtration efficiency (Creatinine and Urea).
• Preparation: Avoid heavy fatty meals or strenuous exercise immediately prior to testing. Stay well hydrated with plain water.

2. Radiological & Imaging Investigations

Digital X-Ray

• Purpose: The fastest imaging technique to inspect bone fractures, joint spacing, chest infections (pneumonia), and dental structures.
• Preparation: You will be asked to remove jewelry, eyeglasses, watches, belts, or clothing containing metallic zippers or buttons around the area being imaged.

Ultrasonography (USG)

• Whole Abdomen / KUB Ultrasound: Used to visualize internal abdominal organs (liver, gallbladder, kidneys, spleen, urinary bladder). Requires overnight fasting (or 6 hours of fasting) to ensure the gallbladder is well distended, followed by drinking 3 to 4 glasses of plain water about an hour before the test to fill the bladder.
• Pregnancy / Anomaly Ultrasound: Tracks fetal development, growth parameters, and anatomical safety without radiation risks. Follow specific bladder fullness instructions provided by your sonologist.

Computed Tomography (CT Scan)

• Purpose: Utilizes specialized X-ray beams rotated around the body to create detailed 3D cross sectional images of the brain, chest, abdomen, or spine. Highly effective for acute trauma, stroke evaluation, and pulmonary assessments.
• Preparation: If your CT scan requires intravenous contrast dye (CECT), you must fast for 4 to 6 hours prior to the procedure. You must also bring a recent Serum Creatinine report to verify that your kidneys can safely filter out the contrast material.

Magnetic Resonance Imaging (MRI)

• Purpose: Uses powerful magnetic fields and radio waves to generate extraordinarily detailed soft tissue images of the brain, spinal cord, ligaments, tendons, and joints without radiation.
• Critical Safety Rules: Because the MRI machine is a massive super magnet, you must notify the technologist if you have any internal metal implants, cardiac pacemakers, artificial heart valves, or metallic surgical clips. All outer metallic objects must be left outside the scanner room.

Tips for Choosing a Diagnostic Facility in Dhaka

• Check Equipment Modernity: Opt for centers utilizing digital radiography, multi slice CT scanners (64 slice, 128 slice or higher), and 1.5T or 3.0T MRI machines for optimal image clarity.
• Verify Report Delivery Timelines: Routine blood tests are typically ready within the same evening, while complex histopathology biopsies or MRI reports often require 24 to 48 hours for senior radiologist review.
• Bring Doctor’s Prescription Slip: Always carry your physician’s official prescription; diagnostic technicians rely on clinical referral notes to tailor precise imaging views.

Find Leading Diagnostic Centers & Hospitals

If you need routine blood investigations, imaging scans, or diagnostic consultations, explore our directory of verified Hospitals and Diagnostic Centers to review facility profiles, location branches, and contact numbers across Bangladesh.