Every year, dozens of trekkers get helicoptered off the Everest Base Camp trail. Not because the trek is impossibly hard — but because their guides ignored basic acclimatization science.

After planning 50+ EBC expeditions, here are the 5 mistakes I see over and over:

1. Skipping the Namche Rest Day

Namche Bazaar (3,440m) is the first major altitude milestone. Some guides push through to "save time." This is negligent. The body needs 36–48 hours to begin producing additional red blood cells at this altitude. Skip this, and your clients are borrowing against a debt that comes due at 4,500m+.

The fix: Two full nights at Namche. Day hike to Everest View Hotel (3,880m) and return. Hike high, sleep low.

2. No Vitals Monitoring

If you're not checking SpO₂ and heart rate twice daily above 3,500m, you're guessing. And guessing kills people.

The fix: Carry a pulse oximeter. Check every client morning and evening. Log it. A sudden SpO₂ drop of 10%+ from baseline is a red flag — even if the client "feels fine."

3. Ignoring the Lake Louise Score

Most guides ask "how do you feel?" and accept "fine" as an answer. Clients lie — they don't want to slow the group or look weak.

The fix: Use the Lake Louise Acute Mountain Sickness scoring system. It asks specific questions about headache, GI symptoms, fatigue, and dizziness with a 0–3 scale. Score of 5+ = stop ascending. No debate.

4. The Dingboche-to-Lobuche Death Sprint

Some itineraries go Dingboche (4,410m) → Lobuche (4,940m) in one day. That's a 530m gain with a sleep altitude nearly at 5,000m. For clients who skipped proper acclimatization at Dingboche, this is where HACE and HAPE begin.

The fix: Two nights at Dingboche with a day hike to Nagarjun Hill (4,800m). Then split the push to Lobuche with an overnight at Thukla (4,620m).

5. No Descent Plan

Every guide has an ascent plan. Almost none have a documented descent protocol. When a client develops HACE symptoms at Gorak Shep at 2 AM, "we'll figure it out" is not a plan.

The fix: Pre-determine descent targets for every camp. Know the helicopter landing zones. Carry emergency medications (dexamethasone, nifedipine). Have the HRA Pheriche radio frequency saved.

---

These aren't advanced techniques — they're the bare minimum for responsible EBC planning.

I built a full course covering the complete day-by-day acclimatization protocol, including client-ready altitude logs, vitals tracking templates, and an emergency descent decision tree. If you're planning EBC treks professionally, this system will set you apart.