Please select the eligibility criteria that correspond to the clinical trial below.
Title: Serum Levels of Doxycycline at the Time of Abortion With Two Dosing Regimens
Brief Summary: This is a randomized double-blind, controlled trial comparing two regimens of pre-abortion doxycycline. The aims of the study are to determine the serum levels of doxycycline when administered pre-operatively 4 hours or approximately 18 hours before a dilation and evacuation (D \& E) abortion. The hypotheses being tested are that subjects who receive doxycycline with food the night before an abortion will have adequate serum levels, but less nausea and vomiting compared to women who take the doxycycline on an empty stomach on the morning of the abortion. Subjects will either take 200mg doxycycline on the night before and 2 caps placebo with a sip of water on the morning of surgery or 2 caps placebo the night before and 200mg doxycycline on the morning of surgery with a sip of water. All capsules will look identical. Diaries, questionnaires and a 10cc sample of blood for doxycycline levels will be collected from the subjects at the time of surgery.


Options:
A: Inclusion Criteria:

* Women presenting with vaginal bleeding in the first trimester of pregnancy and diagnosed to have incomplete abortion

Exclusion Criteria:

* Women with unstable hemodynamic status and shock, signs of sepsis.
B: Inclusion Criteria:

* nonviable intrauterine pregnancy with retained gestational sac in the uterus
* the embryo if visible 5 to 35 mm without a heart beat
* vaginal bleeding
* circulatory stable
* hemoglobin at least 80 g/L

Exclusion Criteria:

* contraindications against misoprostol
C: The inclusion criteria:

* Patients to be female, aged 18-45 years
* Without previous dilatation and curettage
* Undergoing dilatation and curettage for the current delayed miscarriage
* All participants should be with normal liver/rental function and without systemic disease
* Agree to use adequate forms of contraception throughout the study
* Be in good compliance with the follow-up examination according to the study protocol.

The exclusion criteria:

* Known/suspected intolerance or hypersensitivity to hyaluronan or its derivatives
* Genital tract malformation
* Inflammation of genital tract or pelvic cavity, clinical evidence of cancer in genital tract
* Suspected genital tuberculosis
* Abnormal blood coagulation
* Medical histories of peripheral vascular disease, alcohol/drug abuse, and mental illness
* Acute or severe infection
* Autoimmune diseases.
D: Inclusion Criteria:

1. Gestational age 15-23 weeks by ultrasound.
2. Willing and able to sign an informed consent.
3. Placement of cervical dilators. Dilators must be placed before giving any subject doxycycline in order to ensure that all subjects who receive doxycycline will have an abortion.
4. Willing to comply with the study protocol.
5. Age at enrollment of 18 years or more.

Exclusion Criteria:

1. Need for an urgent D \& E. Indications for this include ruptured membranes, advanced cervical dilation, infection, and fetal demise.
2. Allergy to doxycycline or any tetracycline
3. Exposure to or treatment for gonorrhea or chlamydia within the past 90 days.
4. Current or recent (within the past week) use of any other antibiotic.
5. Prior cardiac valve surgery or cardiac valve replacement. These patients should all receive alternative antibiotics for endocarditis prophylaxis.
6. Active use of alcohol, heroin, or cocaine. Active use of alcohol will be defined as more than 2 drinks per day. Any use of heroin or cocaine will be considered exclusionary.

Answer: D