Most healthcare practitioners routinely recommend a glucose screening test (also called a glucose challenge test or GCT) between 24 and 28 weeks of pregnancy to check for gestational diabetes, a high blood sugar condition that some women get during pregnancy.
When you arrive for the test, you'll be given a sugar solution that contains 50 grams of glucose. The stuff tastes like a very sweet soda pop, and you have to get all of it down in five minutes. Some centers keep it chilled or let you pour it over ice and drink it cold. An hour later, a blood sample is taken from your arm to check your blood sugar level.
The idea is to see how efficiently your body processes sugar. If the reading is abnormal (too high), which happens 15 to 23 percent of the time, your practitioner will have you come back for a three-hour glucose tolerance test to see if you really do have gestational diabetes.
HEMATOCRIT (HCT) 
The word hematocrit means "to separate blood," a procedure which is followed following the blood draw through the proper use of a centrifuge. Hematocrit is the measurement of the percentage of red blood cells in whole blood. It is an important determinant of anemia (decreased), polycythemia (increased), dehydration (elevated), increased R.B.C. breakdown in the spleen (elevated), or possible overhydration (elevated).
Hemoglobin is the main transport of oxygen and carbon dioxide in the blood. It is composed of globin a group of amino acids that form a protein and heme which contains iron atoms and the red pigment, porphyrin.
Normal Adult Female Range: 12 - 16%
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In case you've stumbled upon this post and were looking for answers etc.... I consulted a doctor friend of mine who has a doctor father who has been dealing with preggo women for many many years...this is what he had to say:
As I suspected 75mg is a piddly dose of iron. He put women such as yourself (i.e. twin carriers with tendency to anaemia) on 300mg three times daily and started them on folate supplementation too, as well as dietary advice. He did point out that there is a greater degree of haemodilution in women pregnant with twins so that has to be borne in mind too. However, iron studies would give an indication of transferrin levels, % saturation, as well as total iron. What I forgot to mention too was that if you are taking iron tablets then it helps to take them with vitamin C tablets at the same time and not at the same meal as your ‘green leafy vegetables and cereals’. The reason is that the gastric acid with vitamin C helps convert dietary iron to soluble forms for optimal absorption. Phytic acid (in the cereals), phosphate, and oxalate tend to form insoluble complexes that reduce absorption. In any case if you are taking a decent dose of supplementary Fe2+ then it shouldn’t matter when you take it.
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