- For pregnancies at more than 16 weeks of gestation the term low-lying placenta should be used when the placental edge is less than 20 mm from the internal os on transabdominal or transvaginal scanning (TVS).

If the distance between the internal os and the placental edge is 20 mm or more on TVS, the placental location should be recorded as normal and managed as per routine

• The term placenta praevia should be used when the placenta lies directly over the internal os.

Use of UFH predisposes patients to thrombocytopenia..

Obstetric patients who are postoperative and receiving unfractionated heparin should have platelet count monitoring performed from days 4 to 14 ,

or until heparin is stopped.

CTPA delivers a low radiation dose to the fetus

Systemic chemotherapy is contraindicated in the first trimester because of a high rate of fetal
abnormality,but is safe from the second trimester.

Conception during tamoxifen therapy should be avoided because
of potential teratogenicity, and a ‘washout period’ of 2–3 months is advised

Use bladder diaries in the initial assessment of women with urinary
incontinence or overactive bladder.

Encourage women to complete a minimum of 3 days of the diary covering variations in their usual activities, such as both working and leisure days.

There are no firm criteria for initiating red cell transfusion. The decision to provide blood transfusion should be based on both clinical and haematological assessment.

The 2009–12 Confidential Enquiries into Maternal Deaths and Morbidity report3 highlighted the importance
of correlating clinical signs and symptoms expected from different blood loss values to help target decisions on resuscitation, and also emphasised the importance of taking the woman’s weight into account.

The therapeutic target in case of massive blood loss is to maintain Haemoglobin  greater than 8 gm/dL.