Neurological disease such as stroke, motor neurone disease, Alzheimer's and multiple sclerosis aren't diagnosable from blood tests. Similarly, the diagnoses of depression, schizophrenia, ADHD and autism lack a specific blood diagnostic marker.
Sometimes a test doesn't pick up evidence of a disease or condition, even though you actually do have it. For example, if you had a blood test for hepatitis C and the results came back negative, but you were exposed to the virus in the past few months, you could still have an infection and not realize it.
The most likely reason you felt sick to your stomach when you had your blood drawn is that your body was having a vasovagal reaction. This is a physical response from your nervous system. It can be triggered by seeing the needle, seeing your own blood, or just feeling anxious about the whole thing.
Blood tests
But liver function tests can be normal at many stages of liver disease. Blood tests can also detect if you have low levels of certain substances, such as a protein called serum albumin, which is made by the liver. A low level of serum albumin suggests your liver is not functioning properly.
A hypochondriac is someone who lives with the fear that they have a serious, but undiagnosed medical condition, even though diagnostic tests show there is nothing wrong with them. Hypochondriacs experience extreme anxiety from the bodily responses most people take for granted.
Cancer. Cancer misdiagnosis is the most common misdiagnosed disease of all. Different types of cancers are misdiagnosed as well which is why it's important to have a complete medical history of the patient, adequate time to evaluate the patient, and complete information of symptoms and medications.
Many diseases and infections can be asymptomatic, including those that may be potentially fatal in some people. These include (but are not limited to): tuberculosis, breast cancer, endometriosis, HIV/AIDS, herpes, hepatitis, chlamydia, hypertension, common colds/flu, and type-2 diabetes mellitus.
Monitoring an inflammatory condition.
Sometimes false negative results occur when inflammation actually is present. False positive results may occur when abnormal test results suggest inflammation even when none is present.
Aside from leukemia, most cancers cannot be detected in routine blood work, such as a CBC test. However, specific blood tests are designed to identify tumor markers, which are chemicals and proteins that may be found in the blood in higher quantities than normal when cancer is present.
What should I do if I can't get a diagnosis? If you think you have an underlying disease that hasn't been diagnosed, you can ask your primary care provider for a referral to a specialist. And if you or your doctor suspect the disease could be genetic, you can always make an appointment at a medical genetics clinic.
Once the symptoms appear, a blood test generally will reveal very high blood glucose. Type 2 diabetes can be detected easily during a routine screening exam and blood test. However, it frequently can go undiagnosed for years unless a physician draws a blood sample to check the blood glucose.
The most common types of blood tests used to assess heart conditions are: Cardiac enzyme tests (including troponin tests) – these help diagnose or exclude a heart attack. Full blood count (FBC) – this measures different types of blood levels and can show, for example, if there is an infection or if you have anaemia.
In this article, we will explore five of the most common silent diseases: hypertension, diabetes, osteoporosis, sleep apnea, and depression. You'll learn about their causes, symptoms, and treatment options.
Describes a disease of unknown cause.
High blood pressure and diabetes are known as "silent killers" because a lot of the time people have these conditions, but, if they are not seen by their doctor for regular checkups, they do not know that they have them.
Illness anxiety disorder is a chronic mental illness previously known as hypochondria. People with this disorder have a persistent fear that they have a serious or life-threatening illness despite few or no symptoms. Medications and cognitive behavior therapy (CBT) can help.
Pain in your liver itself can feel like a dull throbbing pain or a stabbing sensation in your right upper abdomen just under your ribs. General abdominal pain and discomfort can also be related to swelling from fluid retention and enlargement of your spleen and liver caused by cirrhosis.