Overview & Effectiveness
The big idea: rank methods from most to least effective, and know which one also prevents STIs.
Contraception prevents pregnancy by blocking ovulation, blocking sperm from reaching the egg, or preventing implantation. The LPN/LVN's role is mostly reinforcing teaching — correct use, side effects, warning signs, and follow-up — and supporting the client's informed, voluntary choice.
- Most effective
- Implant, IUD, sterilization. "Set it and forget it" (LARC = long-acting reversible contraception) or permanent. Least user error.
- Very effective
- Injection (Depo-Provera). Depends on returning every ~3 months.
- Effective (user-dependent)
- Pills, patch, vaginal ring. Work well with perfect use; typical use is less reliable (missed pills).
- Less effective
- Male/female condoms, diaphragm, sponge, cervical cap. Barrier methods. Condoms are the only method that also protects against STIs.
- Least effective
- Fertility awareness, withdrawal, spermicide alone. Highest typical-use failure rates.
No hormonal method, IUD, or sterilization protects against sexually transmitted infections — only condoms do. A common exam point: a client on the pill (or with an IUD) who has a new or multiple partners should also use condoms for STI protection.
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Hormonal Methods
Estrogen + progestin vs progestin-only — the difference drives the contraindications.
Hormones prevent pregnancy mainly by suppressing ovulation, thickening cervical mucus, and thinning the endometrium. The key split is whether the method contains estrogen (which carries the clot risk) or is progestin-only.
Combined Hormonal (Estrogen + Progestin)
- Combined oral contraceptive (COC) pillone pill daily
- Take at the same time daily; reduces ovarian & endometrial cancer risk; watch ACHES warning signs.
- Transdermal patchweekly × 3, then off 1 week
- Apply to clean, dry skin (not the breast); rotate sites; may be less effective at higher body weight.
- Vaginal ringin 3 weeks, out 1 week
- Client inserts/removes it; if out >3 hours, use backup.
Benefits of combined methods: more regular, lighter periods; less cramping; lower risk of ovarian and endometrial cancer. Main risk: blood clots (thromboembolism) from estrogen.
Abdominal pain · Chest pain or shortness of breath · Headache (severe/sudden) · Eye problems (blurred vision/loss) · Severe leg pain. These point to a clot, stroke, or hypertension. The classic contraindication: a smoker over age 35 on estrogen — clot risk is too high.
Progestin-Only
- Progestin-only pill ("minipill"): good when estrogen is contraindicated (clot history, smoker >35) and for breastfeeding clients. Must be taken at the same time every day — more than 3 hours late needs backup.
- Depo-Provera injection (medroxyprogesterone): every 11–13 weeks. Side effects: weight gain, irregular bleeding, decreased bone density with long-term use (encourage calcium, vitamin D, weight-bearing exercise); return to fertility may be delayed up to a year.
- Subdermal implant (etonogestrel): placed in the upper arm; lasts about 3 years; irregular bleeding is the most common side effect.
When a question gives you a client who can't have estrogen (history of DVT/PE, stroke, smoker over 35, migraine with aura, or breastfeeding), the safe answer is a progestin-only method (minipill, Depo, implant) or a non-hormonal method (IUD, barrier).
Intrauterine Devices (IUDs)
Two kinds — copper (non-hormonal) and hormonal — and one warning mnemonic: PAINS.
- Copper IUD (non-hormonal)up to ~10 years
- Can cause heavier periods and more cramping; no hormones. Also usable as emergency contraception.
- Hormonal IUD (levonorgestrel)~3–8 years by product
- Usually makes periods lighter; some clients stop having periods.
- Both are highly effective, long-acting, and reversible (fertility returns after removal).
- Teach the client to check for the strings monthly (after each period).
- Risks: expulsion (most likely in the first months), uterine perforation (rare, at insertion), and a small increased risk of pelvic infection in the first weeks.
Period late / abnormal bleeding · Abdominal pain or pain with sex · Infection (abnormal discharge) · Not feeling well, fever, chills · String missing, shorter, or longer. A missing string could mean expulsion or perforation — the client should use a backup method and be evaluated.
Barrier Methods
Block the sperm — and condoms are the STI protector.
- Male/female condom
- The only method that also protects against STIs. Use a new one each time; leave space at the tip (male); use water-based lubricant (oil-based breaks latex).
- Diaphragm
- Fitted by a provider. Use with spermicide; insert before sex; leave in place at least 6 hours after (but not more than 24 — toxic shock risk). Refit after childbirth or a weight change of about 10+ lbs.
- Cervical cap
- Smaller than a diaphragm, used with spermicide; can stay in longer; also provider-fitted.
- Contraceptive sponge
- Over-the-counter; contains spermicide; leave in 6 hours after; do not exceed recommended wear time (TSS risk).
- Spermicide
- Used alone it is one of the least effective methods; best combined with another barrier.
A diaphragm must be re-fitted after childbirth, pelvic surgery, or a weight change of ~10 lbs or more — the fit changes, and a loose diaphragm won't work. Also teach: leave it in at least 6 hours after sex, add more spermicide for repeat intercourse, and don't leave it in over 24 hours (toxic shock syndrome).
Natural / Fertility Awareness Methods
No devices or hormones — track the fertile window and avoid sex then.
- Basal body temperature (BBT): temperature rises about 0.5–1°F after ovulation and stays up. Take it every morning before getting out of bed.
- Cervical mucus (Billings) method: around ovulation, mucus becomes clear, slippery, and stretchy (like raw egg white) — this is the fertile sign.
- Calendar/rhythm & standard days: estimate the fertile window from cycle length; works best with regular cycles.
- Symptothermal: combines BBT + cervical mucus for better accuracy.
- Lactational amenorrhea: exclusive breastfeeding can suppress ovulation temporarily (only reliable under specific conditions).
- Withdrawal (coitus interruptus): low effectiveness — pre-ejaculate can contain sperm.
The most-tested fertility-awareness sign: cervical mucus that is clear, stretchy, and slippery like raw egg white signals ovulation and peak fertility. To avoid pregnancy, the couple abstains during this fertile window. A rise in basal body temperature confirms ovulation has already occurred.
Emergency Contraception
After unprotected sex — sooner is better, and it is not an abortion pill.
- Levonorgestrel (Plan B One-Step): most effective within 72 hours (can be used up to 5 days with declining effectiveness); available over the counter.
- Ulipristal (ella): effective up to 5 days; prescription.
- Copper IUD: the most effective emergency option when inserted within 5 days — and it provides ongoing contraception.
Emergency contraception works mainly by delaying or preventing ovulation — it does not end an established pregnancy and won't harm an existing one. (That is different from mifepristone, the medication-abortion drug.) Teach the client that it is for backup after unprotected sex, not a regular method, and that sooner is more effective.
Permanent Methods (Sterilization)
Considered permanent — and a vasectomy is not effective right away.
- Tubal ligation (female): the fallopian tubes are cut, tied, or blocked so the egg and sperm can't meet. Considered permanent and irreversible; effective right away.
- Vasectomy (male): the vas deferens is cut/tied — simpler and safer than tubal ligation. NOT effective immediately — sperm remain for a while, so the couple must use another method until a semen analysis confirms no sperm (about 12 weeks or ~20 ejaculations).
- Both require informed consent and counseling that the decision is intended to be permanent.
The most-missed teaching point: after a vasectomy the man is still fertile for weeks. The couple must keep using another contraceptive until a semen analysis shows zero sperm. Tubal ligation, by contrast, is effective immediately.
Choosing a Method & Key Teaching
Match the method to the client — and respect their values.
- Support informed, voluntary choice. Provide accurate information about all options without pushing one; honor the client's cultural, religious, and personal values.
- Screen for estrogen contraindications first: clot/stroke history, smoker over 35, uncontrolled hypertension, migraine with aura, breast cancer, liver disease → choose a progestin-only or non-hormonal method.
- Breastfeeding? Avoid estrogen (it can reduce milk supply) — progestin-only methods, IUDs, or barriers are preferred.
- Need STI protection? Add condoms regardless of the primary method.
- Wants nothing to remember? A LARC (IUD or implant) has the lowest user error.
- Teach the warning signs: ACHES for estrogen methods, PAINS for IUDs, and to report leg pain/swelling or chest pain right away.
On the exam, the LPN/LVN's role in family planning is to reinforce teaching and support the client's informed choice — not to decide for them. When a question asks the best nurse response, look for the option that provides accurate information and respects the client's decision, and that screens for contraindications (like estrogen in a smoker over 35) before a method is started.
? A breastfeeding client wants to start contraception — which methods should be avoided?
Frequently Asked Questions
Common student questions on this topic.
What are the ACHES warning signs for combined hormonal contraceptives?
Who should not take estrogen-containing (combined) contraceptives?
What should a client do if she misses a birth control pill?
What is the key teaching for the Depo-Provera (medroxyprogesterone) injection?
What does the IUD warning sign mnemonic PAINS stand for?
How does emergency contraception work, and how soon must it be taken?
Quick-Reference Cheatsheet
Every key point from this guide on a single printable page.
Contraception & Family Planning Cheatsheet
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