For women with pre-existing chronic hypertension, an initial assessment should be performed prior to pregnancy. 4. to achieve appropriate lifestyle changes during pregnancy. 5. to discuss possible adverse effects of antihypertensive medications. Laboratory tests performed are electrocardiogram, urinalysis including bacterial culture and drug sensitivity assay, and 24-hour total urine protein assay and creatinine clearance assay. Additional biochemical tests are performed, especially for renal function, uric acid, lactate dehydrogenase and liver function. A complete blood count analysis, prothrombin time and partial thromboplastin time are also included.