Investigations needed in case of repeated abortions

Most of  the abortions in the early gestational age can be seen as part of avoiding abnormal embryos due to defective germ plasm by the nature.
This can occur due to defective sperm or defective ovum or both.
Usually 50% of the abortions will occur before diagnosing the pregnancy.
Other possible causes are :
Infections,
trauma,
hormonal,
General conditions like thyroid abnormalities, clotting disorders, increased blood sugar levels etc.
Usually abortions due to defective embryo won't repeat in future pregnancies.
Because normally in semen around 30% abnormal forms can be seen and the remaining will be normal forms.
And only few ova can be abnormal.
So, possibility to have the normal embryo is more.
In cases of two to three continuous abortions, following tests are needed to find out the cause:
For the wife:
-General physical and local examination
-Ultrasound
-Hemoglobin
-Blood sugar levels
-TORCH panel
-VDRL
-Thyroid profile
-Antiphospholipid antibodies etc.

For the husband:
Blood sugar levels
VDRL

In case of consaguinous marriage, both should undergo genetic profile.
After undergoing these investigations, one conclusion can be drawn regarding the possible cause for abortion and depending on that treatment can be planned.