What Your Blood Test Can Reveal About Your Health
In my daily practice, I often see patients coming in with blood test reports in hand, feeling confused or even anxious. Many assume that a “normal” or “abnormal” result is a diagnosis by itself—but in reality, blood tests are more like a window into how your body is functioning.
A blood test doesn’t just detect illness. It can also show early warning signs long before symptoms appear.
What a Blood Test Actually Shows
1. Full Blood Count (FBC)
This test looks at red cells, white cells, and platelets.
- Can be caused by many known and unknown disease
- High or low white counts (Blood Test) can be caused by communicable + non communicable diseases.
2. Blood Sugar Levels (Diabetes Screening)
Common tests include fasting glucose or HbA1c.
- Elevated levels may indicate diabetes or prediabetes
- HbA1c shows average sugar control over 3 months
I often remind patients that early diabetes may have no symptoms at all—blood testing is the only way to detect it early.
3. Cholesterol Profile (Heart Risk)
This includes LDL, HDL, and triglycerides.
- High LDL (“bad cholesterol”) increases risk of heart disease and stroke
- Low HDL reduces protective heart effects
Many patients are surprised when cholesterol is high despite feeling completely well.
4. Liver Function Test (LFT)
This assesses enzymes and proteins produced by the liver.
Abnormal results may suggest:
- Fatty liver disease
- Alcohol-related liver
- Viral hepatitis
- Medication side effects
5. Kidney Function Test (KFT)
This checks how well the kidneys are filtering waste.
Changes in creatinine or urea may indicate:
- Dehydration
- Early kidney disease
- Communicable & non communicable diseases.
What Many Patients Don’t Realise
One of the most important lessons I share with patients is this:
Blood tests are most powerful when interpreted together with Ultra Sound & radiological investigations.
A slightly abnormal result does not always mean disease—but patterns across multiple markers often tell the real story.
When Should You Do a Blood Test?
From a preventive point of view, I usually recommend testing if you have:
- Persistent fatigue
- Unexplained weight changes
- Family history of diabetes or heart disease
- High blood pressure
- No screening done in the last 1–2 years
Even without symptoms, routine screening helps detect silent any communicable + non communicable diseases.
Doctor's Insight
In my experience, the biggest value of blood testing is not just diagnosis—but early prevention. Many serious conditions such as diabetes, kidney disease, and high cholesterol begin silently for years.
A simple blood test can give us a chance to act early—before complications develop.
– Dr. Balavendrian Anthony
Physician | Palliative Care
Evercare Medical Care Centre, Penang, Malaysia.
Frequently Asked Questions
No. Only specific tests like fasting glucose or lipid profile may require fasting.
Yes, because it reduces your ability to feel injuries or infections, which can lead to serious complications.
Generally once a year for preventive screening, or as advised based on risk factors.
Not always. Results must be interpreted in context and sometimes repeated.