2,000 Appointments in a Day, 1,800 Slots in Six — Who Is Auditing UNAM's Screening Arithmetic?

October 18, a Sunday morning. Coyoacán, in the south of Mexico City, inside Ciudad Universitaria. Six mobile units are lined up in Parking Lot 3 of the Estadio Olímpico Universitario. The least-discussed detail is the protocol: no deodorant, no talc before a mammogram, clean skin only — because metallic residue creates artifacts on the image, and an artifact means a repeat scan, and a repeat scan means a wasted slot. That single line tells you what this campaign actually is. Not a ribbon-cutting ceremony. A logistics operation, where every slot is a fixed cost and every bad image burns a unit-hour. By the end of day one, roughly 2,000 appointments had been taken. That is the number in circulation. But the first question is not tactical. It is arithmetic. Six mobile units, roughly 50 patients per unit per day, six service days — that multiplies out to about 1,800. The bookings came to 2,000. Which means the campaign oversold its own stated supply by roughly 200 appointments, in a service priced at zero. That is where the story stops being simple. Who runs it matters, because the arithmetic is meaningless without the power map. Operational lead is UNAM's DGAS, the Dirección General de Atención a la Salud. Clinical capital comes from two state bodies: IMSS, Mexico's federal social-security institute, supplies one mobile unit; the Mexico City health secretariat, SSCDMX, supplies five. Five of six units belong to the city, one to the federation. UNAM contributes land, venue, personnel and organisational overhead. In cash terms UNAM's marginal cost is low and its institutional-credit return is high. This is a resource-leverage model, not a charity event: one side puts up the capital equipment, the other puts up the brand and the real estate. The calendar is part of the model too. The service window runs October 18 to October 23, 2026 — six days. World Breast Cancer Day falls on October 19, so the schedule is built around the commemoration rather than around the service. And the venue was chosen precisely because it is, for the rest of the year, only a parking lot. Football enters here, through an unexpected door. The Estadio Olímpico Universitario is Pumas' home ground. October 18 was the date on which the university team was scheduled to face Atlas. So mammography units and matchday traffic share a day, possibly a site. The release does not say whether the fixture was home or away, nor the kickoff time, so the conflict cannot be confirmed — only flagged. That is a logistics gap, not football analysis. Then there is Pumas Femenil. The women's-team players serve as health ambassadors. This is the only genuinely football-adjacent transmission in the whole document, and it has nothing to do with the pitch. It is brand positioning. In Liga MX Femenil the pattern is now established: positioning women's teams as community-facing brand carriers so the squad remains visible outside matchdays. The open question is what investment sits behind the visibility. The economics of a free service are simple. When the price is zero, demand has no ceiling, so the queue has to be rationed by capacity. Here the rationing instrument is the appointment — the currency. Nobody paid money; everybody spent a slot. The currency running out on day one proves demand. Proven demand and delivered service are two different events. Gustavo Olaiz Fernández, the DGAS head, stated clearly that no new registration phase had been announced. That is good expectation management. He also said cancellations may free spaces. That clause is not courtesy. It is a capacity release valve, and an admission that free clinics produce no-shows. In free clinics across Latin America and the United States, no-show rates run well above zero, which means actual patients served will normally fall below the 2,000 registered. So the question nobody is asking is the gap between registered and served. If fewer than 1,800 people are actually screened, the headline inverts. It stops being a triumph of demand and becomes a supply shortfall. And that inversion will happen for arithmetic reasons, not football ones. The second unexamined element is the questionnaire. Patients are being surveyed to identify risk factors specific to the Mexican population, as a research component. Institutionally, that is the largest return and the least discussed. UNAM gains a publication pipeline and grant value whose financial figure appears nowhere. Low marginal cost, long-horizon institutional return — that is the real deal. But there is a silent gap. Health data is being collected, and no consent or data-protection framework is stated anywhere. Mexico's federal personal-data protection law applies to this kind of collection. This is not speculation; it is a legitimate question raised by an absence. The third layer is the venue. A stadium's fixed asset is used 20 to 30 matchdays a year; for the other 335 days it is idle capacity. Converting a parking lot into a clinical site is amortising that idle asset into civic value. In football-economics language this is not a player, it is asset utilisation. Having watched Liga MX and Copa Libertadores matches for years, I know the stadium apron is effectively dead outside matchday. This model puts that dead time to work, and any club with empty matchday parking can copy it. Run the comparison from South Asia and a different layer opens. In Mymensingh I learned that distance is just another data point. There the constraint is not a shortage of parking; it is the road to the screening unit — district town to sub-district, sub-district to union. In Mexico City the supply limit is six units and six days; in much of Bangladesh the limit is geographic spread and transport cost. Both are capacity problems, but the instruments differ. Mexico rations with appointments; Dhaka and Mymensingh ration with distance and travel time. Same disease, different variable. Back to Pumas Femenil. Deploying players as health ambassadors is low-cost brand deployment. It gives women's-team players public roles beyond matchday, which lifts Liga MX Femenil's overall visibility. That is a small but real gain. The risk is transparency: if there is no parallel increase in the women's programme's funding, wages or infrastructure, critics will call it performative ambassadorship. The only rebuttal is a number, and this release contains none. Here is where I dissent. This is not journalism. It is institutional communications. No outlet is named, no byline appears, and the two central figures — 2,000 bookings and 50 patients per unit per day — carry no source attribution. Two senior DGAS officials are quoted, and no adversarial question is asked. The structure matches a UNAM DGAS press release exactly. That is not an accusation; it is an identification. Once identified, the framing is the most visible thing. A supply gap is presented as a triumph. The same fact reads two ways: the public is hungry and we responded, or the public is hungry and we did not provide enough. The release chose the first without asking. The second dissent is less comfortable. Where a suspicious finding appears, patients receive guidance on additional tests, but no guaranteed referral into treatment is stated. A screening programme is worth exactly as much as the referral pipeline behind it. A campaign that can detect a suspicious result and then leaves the patient on an uncertain path delivers detection, not care. A six-day pop-up cannot deliver full oncological care; that is a defensible capacity reality. But the limit must be communicated plainly, or detection converts into anxiety, and the patient pays that bill. The third gap is small and telling: the date. For October 18 to fall on a Sunday, the year must be 2026. The figure is internally consistent, yet it carries the smell of a technical artifact — nobody audited the release numerically. A document that does not check its own calendar is unlikely to have checked its capacity arithmetic. The release clause was never a number. It was a countdown. So is this. The 2,000 appointments are not an achievement; they are a clock, six days long, and at the end it will say how many actually walked in. Three signals to watch. First, registered versus served: if the served figure drops below 1,800, the story turns that day. Second, the referral agreement: whether DGAS or IMSS ever announces a formal pathway. Third, replication: if another club adopts stadium-based screening, the venue-reuse model is validated as strategy rather than a one-off photograph. A transfer is a power map: clauses, wages, agents, and the calendar. A screening campaign is the same — capacity is the clause, no-shows are the wages, the health secretariat is the agent, and the calendar is six days. The next domino is not on the pitch. It is in the referral pathway. If it holds, this is another successful CSR photograph. If it does not, it is a measurable failure nobody will want to own. The question is blunt: six days from now, who publishes the number?