All Blood Tests

For a pregnancy test to become positive, the fertilized egg has to first implant into the uterus and then send enough amounts of hCG the pregnancy hormone into your blood stream for enough hCG to create a positive pregnancy test.

Implantation, when the fertilized egg implants into the endometrium, happens about a week after ovulation (range: 6-12 days), and it takes another 3-4 days after implantation (9-10 dpo: days after ovulation) for the blood pregnancy test to first become positive.

* Blood Pregnancy test: If you are pregnant then the blood pregnancy test is usually positive within 3-4 days after implantation or about 9-10 days after fertilization and ovulation.
* Urine (Home HPT) Pregnancy Test: The urine pregnancy test will usually not become positive in most women until a missed period or about a week after implantation. Many manufacturers of urine pregnancy tests want you to believe that the urine test is usually positive before a missed period, but only about 25% of pregnant women will test positive with the HPT 2 days before a missed period, and about 40% the day before the missed period.

The wide variation when the urine pregnancy test becomes positive is due to four variables which determine when the home urine pregnancy test becomes positive:

1. Timing of Implantation
2. Blood hCG levels
3. Urine hCG level (eg.how concentrated or diluted the urine is)
4. Sensitivity of the pregnancy test

1. Timing of Implantation

A pregnancy test detects the presence of the pregnancy hormone hCG (human chorionic gonadotropin) either in the blood or in the urine. The hCG in the urine comes from the hCG in the blood after it was filtered through the kidney. After ovulation, the egg gets fertilized and travels through the fallopian tube toward the uterus. This travel takes on average about a week. Implantation, the attachment of the fertilized egg in the lining of the uterus, occurs on average about a week or later after ovulation/fertilization, but it can happen as early as six days and as late as 12 days after fertilization/ovulation. At the time of implantation, the placenta starts making the pregnancy hormone hCG, which then enters the blood stream. hCG can be detected in the blood about three to four days after implantation. Urine hCG can be detected about two to three days after blood hCG can first be seen. Detection of hCG depends on timing of implantation, so hCG can normally be detected in the blood between nine and 16 days after ovulation (HPT: 12-19 days after ovulation).

2. Blood hCG Level

There is a wide normal variation of hCG levels, both in the blood and the urine. If a woman has low blood hCG levels, for example, then it can take several more days for it to show up on a pregnancy test.

3. Urine hCG Level

Urine hCG levels change over the course of the day depending on how much you drink and how diluted or concentrated the urine is. Urine pregnancy testing is best done with more concentrated urine. If you drink a lot of fluid, the urine may be too diluted early on in pregnancy to achieve an hCG concentration adequate enough for a positive test.

4. Sensitivity of Urine Home Pregnancy Test

Different pregnancy tests have different sensitivities. The lower the sensitivity, the earlier a pregnancy test becomes positive. Sensitivities are indicated in mIU/mL, the lowest amount of hCG in the urine that tests positive. A sensitivity of 20 mIU/mL requires one-half the hCG level to be positive when compared with a 40 mIU/mL sensitivity level, and it may become positive several days earlier than the pregnancy test with a higher sensitivity. Make sure you read the package of the pregnancy test to determine your pregnancy test’s sensitivity.

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4 Top Tests For Diabetes

Diabetes is a disease caused by a lack of insulin (a hormone that your body relies upon to convert blood sugar into energy) in the body. But how can you test for diabetes and see whether you have contracted the disease yourself? The best way is to go and see your doctor and ask them to test you. They will then be able to give you an accurate diagnosis. In this article I will discuss four of the most popular diabetes tests that your doctor is likely to use.

1) FASTING PLASMA GLUCOSE (FPG) TEST:- The FPG test has become one of the most popular diabetes tests. The main drawback with the FPG test is that it is not suitable to test for gestational diabetes (a form of diabetes which develops during pregnancy). However, if you are not pregnant the chances are that your doctor will use this test to make their diagnosis.
To begin you will be scheduled in for a FPG test. Your doctor will require you to eat nothing for at least eight hours prior to the test. During the test they will take a blood sample and measure your blood glucose levels. They will then analyse the blood sample and diagnose you based on the following rules:

- A blood sugar level of 99 milligrams per decilitre (mg/dL) or less = Normal.
- A blood sugar level of between 100 mg/dL and 125 mg/dL = Impaired Fasting Glucose (a form of pre-diabetes which if left untreated can develop into type 2 diabetes).
- A blood sugar level of 126 mg/dL or greater = Type 1 or type 2 diabetes. In this instance you will be given another FPG for accuracy. If both FPGs suggest that you have diabetes your doctor will investigate further and diagnose you with type 1 or type 2 diabetes

2) ORAL GLUCOSE TOLERANCE TEST (OGTT):- This test is similar to the FPG but it can be used to diagnose all types of diabetes. If you are a man or non-pregnant woman your doctor will book you in for an FPG test. Following the FPG test they will then give you a drink containing glucose and take regular blood samples after you have drank it. If you are pregnant you will be given the glucose drink without an FPG test and regular blood samples will be taken following consumption. In both variations the final blood sample will be used to make a diagnosis based on the following rules:

- A blood sugar level of 140 mg/dL or less = Normal.
- A blood sugar level of between 140 mg/dL and 199 mg/dL = Impaired Fasting Glucose (a form of pre-diabetes which if left untreated can develop into type 2 diabetes).
- A blood sugar reading of 200 mg/dL or greater = Type 1, type 2 or gestational diabetes. If you are a pregnant woman then you will be diagnosed with gestational diabetes. Otherwise your doctor will investigate further and diagnose you with type 1 or type 2 diabetes.

3) RANDOM BLOOD GLUCOSE (RBG) TEST:- The RBG does exactly what it says and involves a random blood test being taken. RBG tests can be performed without the assistance of your doctor using a glucose meter (a piece of medical equipment that calculates the approximate level of glucose in your blood). The test involves pricking your finger with a lancing device (a device which draws a small amount of blood from your finger), placing the blood on a test strip and then inserting this test strip into your glucose meter to get a reading. If multiple RBG tests show that you have blood sugar levels higher than 200 mg/dL then you may have diabetes.

Although RBG tests are easy to perform they should NOT be used as the only test when diagnosing diabetes. They are approximately 10% as accurate as laboratory tests and therefore any concerns you may have as the result of multiple RBG tests should be followed up with your doctor. Only your doctor will be able to give you a full and accurate diagnosis.

4) GLYCOSYLATED HAEMOGLOBIN TEST:- Glycosylated haemoglobin is the term used to describe haemoglobin that has bound with glucose. Glycosylated haemoglobin cells usually last for between two to four months. If you have diabetes or you are not managing your diabetes effectively the level of glycosylated haemoglobin in your blood will increase. To begin the gylcosylated haemoglobin test your doctor will take a blood sample and analyse the glycosylated haemoglobin levels based on the following results:

- Glycosylated haemoglobin levels of between 4% and 6% = Normal.
- Glycosylated haemoglobin levels below 7% = Diabetes that is under control.
- Glycosylated haemoglobin levels greater than 7% = Diabetes that is not under control.

I hope this article has shown you that there are multiple tests available to determine whether or not you have diabetes. However, you must remember that these tests are useless unless performed under the supervision of a doctor or other qualified medical professional. Many factors can affect your test results and your doctor will be able to look at all the relevant factors and then make an accurate diagnosis. If you think you may have diabetes and want a solid answer then go see your doctor and get yourself tested today.

Every intention has been made to make this article accurate and informative but it is intended for general information only. Diabetes is a medical condition and this article is not intended as a substitute for the advice of your doctor or a qualified medical practitioner. If you have any concerns regarding any form of diabetes you should seek the advice of your doctor immediately.